It will generate a link which can access only one time. So it's only for the relevant recipient.
ZeroNote will generate a secure link, then the user has to send it to the recipient.
Yes, you can, using advanced options you can create a note which destroys after a time period, the note will be deleted only after that specified time is completed.
The note self-destructs after being read, there is no way to re-read it once it has been read.
After 14 days or after the time selected in the advanced options all unread notes are automatically deleted.
To protect the service from abuse, requests are rate limited per IP address. Normal use is never affected, but if you send a large number of requests in a short period you may be temporarily blocked for a few seconds. If that happens, simply wait a moment and try again.